The number 14 of the process carbon 14 dating denotes

The reforms of Julius Caesar in 45 BC put the Roman world on a solar calendar.

This Julian calendar was faulty in that its intercalation still allowed the astronomical solstices and equinoxes to advance against it by about 11 minutes per year.

Increasingly, personal electronic devices display both calendars and clocks simultaneously.

The number (as on a clock dial or calendar) that marks the occurrence of a specified event as to hour or date is obtained by counting from a fiducial epoch—a central reference point.

They could be used to measure the hours even at night, but required manual upkeep to replenish the flow of water.

The Ancient Greeks and the people from Chaldea (southeastern Mesopotamia) regularly maintained timekeeping records as an essential part of their astronomical observations.

Lunar calendars were among the first to appear, either 12 or 13 lunar months (either 354 or 384 days).

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These calendars were religiously and astronomically based, with 18 months in a year and 20 days in a month, plus five epagomenal days at the end of the year.Lunisolar calendars have a thirteenth month added to some years to make up for the difference between a full year (now known to be about 365.24 days) and a year of just twelve lunar months.The numbers twelve and thirteen came to feature prominently in many cultures, at least partly due to this relationship of months to years.Arab inventors and engineers in particular made improvements on the use of water clocks up to the Middle Ages.Incense sticks and candles were, and are, commonly used to measure time in temples and churches across the globe.

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